Product Description:

The PMB31D-20100-00 is a brushless servomotor manufactured by Pacific Scientific and assigned to the PMB Brushless Servomotors series. It serves as the rotary element in closed-loop motion systems, converting electrical drive current into controlled torque for positioning tables, feeders, and labelers on automated lines. The motor is sized for medium-duty axes and works with standard digital amplifiers commonly used in industrial automation.

Physically, the unit uses a NEMA Size 34 frame, so its mounting face and pilot diameter match other 3.4-inch square motors used in the same envelope. At a rated supply of 240 Vac, the phase windings can sustain a nominal stall current of 5.4 ARMS, which gives the matched amplifier a clear current limit during low-speed or holding operation. Power and feedback exit through flying leads with AMP connectors, which allows flexible cable routing where fixed receptacles would limit orientation. Rotor position is returned by a resolver, a two-phase analog sensor that tolerates high temperatures and resists electrical noise. Mechanical torque is transferred through a square key on the shaft, helping pulleys or couplings stay locked to the motor during repeated starts and stops.

As a standard motor, the PMB31D-20100-00 uses catalog windings and magnets rather than a custom configuration. Its electromagnetic section uses a stack length multiple of 1, the shortest lamination stack offered in the family, which helps reduce rotor inertia for axes that favor rapid acceleration over continuous torque output. The motor is identified as a PMB Series Brushless Servomotor, placing it within the baseline PMB platform for insulation, bearings, and general thermal behavior. This layout suits compact motion axes where responsive speed changes matter more than maximum sustained output.